Texas Instruments LMS3655 Bedienungsanleitung

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Output Current (A)

Efficiency

0.0010.010.1110

80%

82%

84%

86%

88%

90%

92%

94%

96%

98%

100%

LMS3

V

IN

= 12

V

IN

= 24

PVIN 1

PGND1

BIAS

VCC

CBOOT

SW

EN

AVIN

FPWM

RESET

V

OUT

LMS3655

AGND

10 µF

470 nF

PVIN 2

PGND2

SYNC

FB

NC

VIN

3.5 V to 36 V

10 µF

4.7 µF

10 µF

0.1 µF

CFF

RFBT

RFBB

L1=10 µH

3 X 47 µF

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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LMS3655

SNAS744B–JULY2017–REVISEDMARCH2018

LMS36555.5-A,36-VSynchronous,400-kHzDC-DCStep-DownConverter

1

1Features

1

•96%PeakEfficiencyWhileConverting12Vto5V

•LowEMIandSwitchNoise

–MinimizedSwitchNodeRinging

–Pseudo-RandomSpreadSpectrum

•400-kHz(±10%)FixedSwitchingFrequency

•–40°Cto+150°CJunctionTemperatureRange

•ExternalFrequencySynchronization

•RESETOutputWithInternalFilterand3-ms

ReleaseTimer

•AutomaticLightLoadModeforImproved

Efficiency

•Pin-SelectableForcedPWMMode

•Built-InCompensation,SoftStart,CurrentLimit,

ThermalShutdown,andUVLO

•0.35-VDropoutWith3.5-ALoadat25°C(Typical)

•32-µAI

Q_VIN

:QuiescentCurrentat3.3V

OUT

and

NoLoad(Typical)

•5.5-AContinuousLoadCurrent

•AdjustableOutputVoltage(1Vto20V)

•±1.5%ReferenceVoltageTolerance

•4-mm×5-mm,0.5-mmPitchSONPackage

2Applications

•Noise-SensitiveMedicalApplications

•Telecom

•HighPerformanceIndustrial

3Description

TheLMS3655synchronousbuckregulatorsare

optimizedforhighperformanceapplications,

providinganadjustableoutputof1Vto20V.

SeamlesstransitionbetweenPWMandPFMmodes,

alongwithalowquiescentcurrent,ensureshigh

efficiencyandsuperiortransientresponsesatall

loads.

Advancedhigh-speedcircuitryallowstheLMS3655to

regulateaninputof24Vtoanoutputof3.3Vata

fixedfrequencyof400kHzwhilealsoenablinga

continuousloadcurrentof5.5A.Aninnovative

frequencyfoldbackarchitectureallowsthisdeviceto

regulatea3.3-Voutputfromaninputvoltageofonly

3.5V.Theinputvoltagecanrangeupto36V,with

transienttoleranceupto42V,easinginputsurge

protectiondesign.

Anopen-drainresetoutput,withbuilt-infilteringand

delay,providesatrueindicationofsystemstatus.

Thisfeaturenegatestherequirementforanadditional

supervisorycomponent,savingcostandboard

space.

DeviceInformation

(1)

DEVICENAMEPACKAGEBODYSIZE

LMS3655VQFN-HR(22)4.00mm×5.00mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

TypicalApplicationCircuitLMS3655Efficiency:V

OUT

=5V

Produktspezifikationen